Kulna, the Mad Queen

When you cast Kulna, the Mad Queen, destroy target creature, then put a 2/2 black Zombie creature token onto the battlefield.
Whenever a creature would die, you may pay {b}{c}. If you do, exile it instead and put a 1/1 colorless Eldrazi Scion creature token onto the battlefield. It has "Sacrifice this creature: Add {c} to your mana pool."
She serves those that drove her mad.